@Entity
@Name("Customer")
public class Customer implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long customerId;
    private String companyName;
    private String form;
    private String tva;
    private String emailInvoices;       
    @Column(nullable = false)
    private String adress1;   
    private String adress2;   
    @Column(nullable = false)
    private Long postalCode;
    @Column(nullable = false)
    private String city;
    @Column(nullable = false)
    private String country;
    private Long phone;
    @Column(nullable = false)
    private Long fax;
   
    /**
     *Creates the foreign key in relation to the Order table
     */   
    @OneToMany(mappedBy = "customer", cascade = CascadeType.PERSIST)
    private List<Order> orders;
   
    /**
     *Creates the foreign key in relation to the Contact table
     */
    @OneToMany(mappedBy = "customer", cascade = CascadeType.PERSIST)
    private List<Contact> contacts;
   
    /** Creates a new instance of Client */
    public Customer() {
     
   
    }
getters and setters......

@Entity
@Table(name = "client_order")
public class Order implements Serializable {
   
    public static enum PaymentType {creditcard, transfert, check};

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long orderId;
   
    @Column(nullable = false)
    @Temporal(TemporalType.DATE)
    private Date orderDate;
    @Column(nullable = false)
    @Temporal(TemporalType.DATE)
    private Date endDate;
    @Temporal(TemporalType.DATE)
    private Date paymentDate;
    private Boolean paymentStatus;
    private PaymentType type;

   
    /**
     *Creates the foreign key in relation to the Partner table
     */
    @ManyToOne
    @JoinColumn (name = "partnerId_fk")
    private Partner partner;
   
    /**
     *Creates the foreign key in relation to the Customer table
     */
    @ManyToOne
    @JoinColumn (name = "customerId_fk")
    private Customer customer;
   
    /**
     *This table creates the joint between the purchase order and its lines of order.
     *The primary key of this table is consisted of the two foreign keys.
     */         
    @OneToMany(mappedBy = "order", cascade = CascadeType.PERSIST)
    private List<OrderLine> orderLines;
    /**
     * Creates a new instance of Order
     */
    public Order() {
    }
.....

@Entity
@Name("OrderLine")
public class OrderLine implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long lineId;
   
    /**
     *Creates the foreign key in relation to the Product table
     */
    @OneToOne
    @JoinColumn (name = "productId_fk", nullable = false)
    private Product product;
   
       
    /**
     *Creates the foreign key in relation to the Contact table
     */
   
    @ManyToOne
    @JoinColumn (name = "orderId")
    private Order order;
   
    @OneToMany(mappedBy = "line",fetch=FetchType.LAZY, cascade = CascadeType.PERSIST)
    private List<Server> servers;
   
    /**
     *Creates the foreign key in relation to the Discount table
     */
    @ManyToOne
    @JoinColumn (name = "discount")
    private Discount discount;
   
       
   
    /** Creates a new instance of OrderLine */
    public OrderLine() {
    }
....

@Entity
@Name("Contact")
public class Contact implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long contactId;
   
    @Column(nullable = false)
    private String firstName;
   
    @Column(nullable = false)
    private String lastName;
   

    private Long phone;
   
    private Long otherPhone;
   
    private Long fax;
   
    @Column(nullable = false)
    private String mail;
   
    @Column(nullable = false)
    private String username;
   
    @Column(nullable = false)
    private String password;
   

    private Date notifyStart;
   

    private Date notifyEnd;
   
    private String position;
       
    /**
     *Creates the foreign key in relation to the Customer table
     */
    @ManyToOne
    @JoinColumn (name = "customerId_fk")
    private Customer customer;
   
   
   
    /**
     *Creates the foreign key in relation to the ContactReportBinder table
     */

    @OneToMany(mappedBy = "contact", cascade = CascadeType.PERSIST)
    private List<ContactReportBinder> Binders;
   
     
    /** Creates a new instance of Contact */
    public Contact() {
    }
......

@Entity
@Name("ContactReportBinder")
public class ContactReportBinder implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long binderId;
   
    /**
     *Creates the foreign key in relation to the Report table
     */
    @OneToMany(mappedBy = "binder")
    private List<Report> reports;
   
    /**
     *Creates the foreign key in relation to the Contact table
     */
    @ManyToOne
    @JoinColumn (name = "contactId_fk")
    private Contact contact;
   
    /**
     *Creates the foreign key in relation to the OrderLine table
     */
    @OneToOne(cascade=CascadeType.PERSIST)
    @JoinColumn(name = "lineId_fk")
    private OrderLine line;
   
    /** Creates a new instance of ContactReportBinder */
    public ContactReportBinder() {
    }
......